An erect herb to 140 cm. The stems are dark green, hollow and five-angled. Leaves are deeply lobed with a basal rosette. The yellow flowers are up to 6 mm in diameter.
This species has soft, thin leaves and wrinkled fruit (achemes) with ribs but not hooks.
Annual. The hollow stems exude a white milky liquid if damaged.
Flowers most of the year
Tracheophyta (Vascular Plants)
Magnoliopsida (Flowering Plants)
Source: Atlas of Living Australia
Native to the Northern Hemisphere. Occurs throughout Vic. A very common weed of gardens and disturbed areas. Will also invade native vegetation.
Similar to the introduced Prickly Sow-thistle S. asper which has leathery divided leaves, smaller seed head and sharp spines, and to Native Sow-thistle S. hydrophilus.